Gearing.



W. B. JOHNSON.

GBARING.

APPLIGQTION FILED JAN. 24, 1911.

1,050,769. I Patented Jan. 14,1913.

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UNITED STATES PATENT OFFICE.

WILLIAM B. JOHNSON, OF ROCKFORD, ILLINOIS, ASSIGNOR T0 ROCKFORD LATHE &DRILL COMPANY, OF ROCKFORD, ILLINOIS, A CORPORATION OF ILLINOIS.

GEARING.

Specification of Letters Patent.

Patented Jan. 14, 1913.

To all whom it may concern:

Be it known that I, WILLIAM B. JOHNSON, a citizen of the United States,residing at Rockford, in the county of Winnebago and State of Illinois,have invented certain new and useful Improvements in Gearing, of whichthe following is a specification.

The object of this invention is to construct a drilling machine in whicha belt connection is formed between the drill spindle and counter shaft,and passing over idlers, and in which means for taking up the slack ofthe belt is provided.

In the accompanying drawings. Figure 1 is a plan view of the mechanismfor moving the idlers. Fig. 2 is an end elevation. Fig. 3 is a sectionon dotted line a a Fig. 1. Fig. 4 is a section on dotted line b b Fig.2. Fig. 5 is a section on dotted line 0 0 Fig. 2. Fig. 6 is aperspective view of the complete drill.

The drill in the main is of an old construction, and comprises thecolumn 1 supported on the base 2. A table 3 is supported by the column.The upper portion of the column has an overhanging head 4:, and beneaththis head extends an arm 5. A drill spindle 6 is guided in theoverhanging head 4: andarm 5, and is rotated by the pulley 7 A drivepulley 8 is located in connection with the base of the drill. A bracket9 extends from the upper portion of the column 1, and has a tubularportion 10 within which is located a rod 11, capable of a slidingmovement therein. To one end of this rod 11 is secured a cross bar 12from which are suspended two yokes 13 supporting idle pulleys 14. A belt15 connects the pulley 7 and the drive pulley 8' and passes over theidlers 14, and by moving the rod 11, the idlers can be adjusted to takeup the slack of the belt. To the rod 11 is pinned a yoke comprising thehub ends 16 connected by the side bar 17, and rack bar 18.

From the tubular portion 10 of the column extends a perforated car 19. Ashort shaft 20 is located in the ear 19 and has a knob 21 secured to oneend, and a spur pinion 22 secured to its other end. The spur pinion 22meshes with the rack 18, and the rod 20 rests on the upper face of thebar 17, which engagement serves to hold the rod 11 from angularmovement.

By means of the knob 21, the spur pinion 22 is rotated which will movethe rack 18 carrying the rod 11 with it. As the rod 11 is moved, theidlers 14 carried thereby will be moved bodily, and the slack in thebelt 15 will be taken up.

I claim as my invention.

1. In a drilling machine, the combination with the supporting frame, ofa drill spindle journaled therein, a pulley on said spindle, a drivepulley, and intermediate idle pulleys, a belt connecting the drillspindle pulley and drive pulley and passing over said idle pulleys, arod slidably mounted in said frame, said idle pulleys being carried bysaid rod, a rack rigidly secured to said rod, a shaft journaled in saidframe adjacent said rod, and a pinion secured to said shaft and adaptedto engage said rack, whereby said rod and idle pulleys may be shiftedrelative to the frame to vary the tension of the belt, and meanscooperating with said shaft for preventing rotation of said rod relativeto said frame.

2. In a drilling machine, the combination of a drill spindle, a pulleyfor rotatin the spindle, a drive pulley, and interme iate idle pulleys,a belt connecting the pulley of the drill spindle and the drive pulley,and passing over the idle pulleys, a rod by which the idle pulleys aresupported, a yoke connected to the rod and comprising two bars, oneprovided with a rack, a shaft mounted in a bearing in the drill frame, aspur pinion secured to the shaft and meshing with the rack, the bars ofthe yoke contacting with the shaft, and a knob for rotating the shaftand thereby preventing rotation of said rod.

In testimony whereof I have hereunto set my hand in presence of twosubscribing witnesses.

WILLIAM B. JOHNSON.

Witnesses:

A. O. BEHEL, E. D. E. N. BEHEL.

Copies 0! this patent may be obtained for five cents each, by addressingthe Commissioner of Patents, Washington, I). G.

